Updates the Gradle namespace/applicationId, moves MainActivity.kt to the
matching source directory, and refreshes the package id in the README.
The Dart package name in pubspec.yaml is unchanged. Since the application
id changed, existing installs will not upgrade in place and their local
secure-storage/prefs data does not carry over.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Flutter only adds android.permission.INTERNET to the debug and profile
manifests, so release APKs shipped with no network access at all — the app
could not reach the API Server. Declaring it in the main manifest fixes
release/production builds; debug was unaffected because its own manifest
already granted it.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
